public class Example4_10 {
    public static void main(String args[]) {
	Lader1.下底 = 100 ;
	Lader1 laderOne = new Lader1 ();
	Lader1 laderTwo = new Lader1 ();
	lader1One.设置上底(28);
	lader1Two.设置上底(66);
	System.out.println("lader1One的上底:"+lader1One.获取上底());
	System.out.println("lader1One的下底:"+lader1One.获取下底());
	System.out.println("lader1Two的上底:"+lader1Two.获取上底());
	System.out.println("lader1Two的下底:"+lader1Two.获取下底());
	}


}
